Re: QMX+ First 1000 QSOs Impresions
Hans is likely to get a big head with all that praise.? I'm sure most of it is due to that "under the roof dipole."? :)? :)??
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Seriously though, it is a remarkable radio. While I'm way down in the corner of a large country, I am also seeing plenty of contacts and amazing distances.
--
72 de N4REE, Bob Easton - QRP CW forever
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Re: QRSS mode and other capabilities of Ultimate 3S
I have "Shortwave DX Handbook" from Enrico Stumpf-Siering, DL2VR
and "Ham Radio DX a complete guide" from Lucas L. Ford, W6AER
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Regards
Herbert
No call sign up till now
George Korper via groups.io <georgekorper@...> hat am 08.05.2025 13:44 GMT geschrieben:
?
?
Hi anyone,
I would like to learn more about weak signal modes?
Please suggest a good book for beginners.
TNX,
George
K3GK
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Re: How to use ProgRock2 in an oscillator?
Steve,
?
The ProgRock2 is a tiny square wave generator (Si5351a) -- it replaces the entire oscillator circuit -- you don't use it in a Colpitts oscillator, you replace the oscillator with the ProgRock2.? The ProgRock2 has three outputs, each with eight selectable frequencies (banks 0 thru 7).? By default, bank 0 is output, so if you only need one frequency, there's no need for switching.? The switching involves a logic pattern of grounding three select pins.? What I do is use a diode matrix and transistors to present grounds to those selection pads in the correct sequence.? The ProgRock2 needs a stable voltage source for operations -- I use a LM7805 voltage regulator and give it a clean 5 volts.??
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The square wave is usually not an issue, but of course it depends on your application and the circuit involved.
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I've attached a couple of photos that show how I implement the ProgRock2 in a Heathkit HX-1681 transmitter.? It replaces the entire oscillator section on the HFO/Mixer board, and the frequency output is selected by a voltage coming from the band switch.? The output of the ProgRock2 is buffered by a 74ACT08, which was recommended by Hans.
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If you want to know more, I've written extensively about how to implement the ProgRock2 in both ER Magazine and Spectrum Monitor. ?The ProgRock2 is a nifty way to get around the problem of flaky/drifted crystals.
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73 - Steve, KW4H
Tucson, AZ
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?
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QRSS mode and other capabilities of Ultimate 3S
Hi anyone,
I would like to learn more about weak signal modes?
Please suggest a good book for beginners.
TNX,
George
K3GK
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Re: Introducing QMX CARROT
Chris,
That's a great design!? I've been thinking about making something similar, but I hadn't thought of the speaker.
Have you thought about writing this up for a QRP Quarterly article?
?
73,
Mike, KL7MJ
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Re: QMX USB device not recognized by windows
Hi, yes it works now. Changed Device Parameters in registry as well (EnhancedPowerManagementEnabled) and switched the QMX In Firmware update mode..
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Sometimes its good to ask, when you don't see the simple part,hi.
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Many thanks for the hint.
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Cheers and 73, Mat DF2OF
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Re: Feature Request List?
Hans,
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Would it be possible that when an external microphone is plugged into the paddle socket that SSB:Input be automatically set to "Ext. Mic" and that if there is no external microphone plugged in that it is automatically set to "USB"???
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That would make going from SSB QSO's to VarAC/JS8Call and back easier.? ??
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Best,
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Jim
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Show quoted text
The VOX enable seems to have a firmware bug - but (for me, at least) it is an easy issue to work around.
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Here is the bug:
Whenever you enter a menu, then come out of the menu system, the VOX ceases to work -- at least until you press the menu exit button again, which in this case changes the VFO mode.
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I think this bug happened recently.? Hans updated the firmware to defeat vox while pressing menu buttons (because the button presses were triggering the VOX).? Then the VOX is re-enabled when exiting the menus.? But for some reason there seems to have been an error introduced which requires an extra level of menu-exit to re-enable VOX.? And I think pressing the 'Tune' encoder button will also set it to working again.
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I set the VOX sensitivity to about 35 and it works fine with my reasonably-sensitive microphone, after enabled as noted above.
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Stan KC7XE
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#QMX+ MIC circuitry improvement
Hello QRPers
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I would like to suggest an improvement I did in MIC circuit in my QMX+. Existing circuit is quite simple and powered from not very clean VDD. By adding two capacitors (100n, could be more) and two resistors (33k, 1k) I was able to reduce the audio noise on the other side receiver by 6 to 8 dB (simple check with Audacity peak meter on two recordings, before and after, FT-891 as a receiver). This will improve SSB signal, especially on higher bands (low band noise). I assume the same will apply to the internal mic circuit.
It would be also good to use filtered VDD, same as for microcontroller ADC (from C214), but I did not wanted to have a wire across the board. Maybe a separation resistor on the microcontroller key/paddle line can also help but I think most of the noise is getting in because of dirty digital supply used for bias.
I think it is worth to consider in case of next PCB revision, both QMX and QMX+.?
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73
Pawe? SO8FM
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Hans was going to implement some sort of scripting language.?? Maybe that could leave the back burner now that SSB is real?
Yes. Once I get to Dayton and back...
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Hi everyone,
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I've been using my QMX for about an year with great joy and happiness when suddenly my QMX stopped receiving or transmitting.
I'm fairly new to radio and i am struggling to find the problem.
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The sweeps are all garbage on all freqs: RF filter sweep, Audio Filter Sweep, everything but the LPF sweeps.
The Voltages seem good although when I press "T", the transmitter voltage shows 9.8v in red. My QMX is 12V.
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I have little knowledge and i need a hand from you guys, to know where to start.
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I zipped and attached the image sweeps.
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73
Pedro - CR7BJL
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Re: Mini Microphones for QMX SSB
Hello, at the moment i can't see your email (difficulties with created account there) on qrz.com. And i see two Erik Larsons there. What about sending such microphones to Europe?
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Re: Firmware updated to 1.02_000 - QMX has changed from 60/40/30/20/17/15 to 80/60/40/30/20?
I am not 100% in the know, but I saw a few videos that after updating firmware, they did a factory reset and they had to choose the bands their radio was made for. I cannot advise if this is obtainable without doing a factory reset. It may be possible to change via a windows machine using the diagnostic tools
Hello!
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As the title says, I've just updated the firmware and now seeing my radio is showing as 80/60/40/30/20m rather than the 60/40/30/20/17/15 version that was built.
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I wondered if anyone has any ideas of how this might have occurred?
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Many thanks!
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Alastair 2E0UOE
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
Hi Michael, there is already a thread covering this ¡..
QMX+ with ~1000 tone on 12M & 6M
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I did sent it to Hans direct some time ago but so far no response. I also see the poor sensitivity on 6m.
No-one on the forum seems to have come back with a solution yet.
73 Ken G4APB
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QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
Hello,
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I? recently build QMX+ and noticed a huge
noise floor and wistling a 6 m.
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Therfore I measured sensitifity using a signal generator.
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| Band [MHz] |
Sens [dBm]@Noise+10dB |
Noise [dB] |
| 1,85 |
-100,0 |
0 |
| 3,65 |
-106,0 |
0 |
| 5,35 |
-107,0 |
6 |
| 7,07 |
-107,0 |
0 |
| 10,14 |
-110,0 |
2 |
| 14,23 |
-107,0 |
1 |
| 18,1 |
-103,0 |
4 |
| 21,04 |
-99,0 |
9 |
| 24,9 |
-97,0 |
7 |
| 28,1 |
-103,0 |
5 |
| 50,5 |
-79,0 |
20 |
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Method: injection of signal Rx frequency + 1,1 kHz Mode: Digi
Noise: signal detected by WSJT-X
Sens: Noise floor + 10 dB
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Noise floor is increasing by frequency, but at 6 m wistling and digital noise make RX unusable.
Output at 6m is about 2 W at 9V Vbat (12V Version)
1,5 kHz wistle starts at 20 m and is increasing by frequency
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Using wsjt-X i evalating waterfall diagram: (QMX+ at 50 Ohm)
AVE:1, cumulative
Noise [dB] : signal by WSJT-X
?signal in waterfall diagram AU?
| QMX+ |
? |
? |
freq [Hz] |
freq [Hz] |
freq [Hz] |
freq [Hz] |
freq [Hz] |
freq [Hz] |
| Frequency [MHz] |
Noise [db] |
Noisefloor |
500 |
1000 |
1500 |
2000 |
2500 |
3000 |
| 1,84 |
0 |
0,2 |
0,2 |
0,2 |
0,8 |
0,2 |
0,2 |
0,2 |
| 3,57 |
0 |
0,3 |
0,3 |
0,3 |
0,7 |
0,3 |
0,3 |
0,3 |
| 5,3 |
1 |
0,5 |
0,5 |
0,5 |
1 |
0,5 |
0,5 |
0,5 |
| 7,04 |
5 |
0,8 |
0,8 |
0,8 |
1,1 |
0,8 |
0,8 |
0,8 |
| 10,1 |
1 |
0,5 |
0,5 |
0,5 |
0,5 |
0,5 |
0,5 |
0,5 |
| 14,1 |
1 |
0,5 |
0,5 |
1,3 |
2,8 |
2,1 |
0,5 |
1,5 |
| 18,1 |
5 |
0,8 |
1 |
1,8 |
2,3 |
2,1 |
1,1 |
2 |
| 21,1 |
7 |
1 |
1 |
2,1 |
2,6 |
2,1 |
1,1 |
2,1 |
| 24,9 |
7 |
1 |
1,2 |
2,7 |
2,8 |
2,7 |
1,3 |
2,5 |
| 28,1 |
7 |
1 |
1,2 |
2 |
1,5 |
1,5 |
1,2 |
2,2 |
| 50,3 |
22 |
1,8 |
2,5 |
3,8 |
4,2 |
3,9 |
2,8 |
3,8 |
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At higher bands 1,5kHz signal is constant and independent from RX freuqency.
?
At 6m additional audio signals are appearing.?
?
6m RF Filter seems to be ok.
?
Any suggestions to detect cause?
?
vy 73 Michael (DF6TV)
?
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Re: QCX-mini LCD backlight not coming on
Heading¡¯s stated model makes this a bit confusing ¡?
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Re: QMX + VARA HF for Winlink
Also, radio will only transmit in SSB, not Digi. Is that usual?
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Re: QMX + VARA HF for Winlink
Thank you. I updated the firmware from -09 to -12 and got USB Gain to appear. Interestingly, I cannot increase it, only decrease it (almost like the VFO knob doesn¡¯t work).
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Still no audio input to the PC. Shouldn¡¯t you be getting input on the VU, even if you¡¯re not in a session?
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Re: Introducing QMX CARROT
This looks really brilliant, I would be curious to see how you manage to make the Fuchs kreis tuner fit in there !
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73,
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Yannig - F4IUJ
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Re: Firmware updated to 1.02_000 - QMX has changed from 60/40/30/20/17/15 to 80/60/40/30/20?
Thanks! That's sorted it.
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N4REE - Bob
Bruce Akhurst
Alastair Moore